I'm not Packy, but here's my Song experience.
We flew Boston- Orlando then Ft Myers- Boston. The outbound trip was a bit of a nightmare. Firstly, in spite of emails and assurances to the contrary, they had assigned us four seats in separate parts of the airplane (I have a 2 yo and a 4yo).
The line for check in was HUGE at Boston and there were 3 desks open. We weren't allowed to check in at the self-service as we had paper tickets so we had to wait an hour to be checked in. At the desk, the lady told me she had put a special request down to the gate to get us at least 2 seats together.
When we got to the gate, there was a TV screen listing 'standby' passengers. There was one family who had been assigned 4 seats together and we had been assigned one seat. We asked the gate clerk and he said, 'Oh we've managed to get you 4 seats on the flight' HUH??? I said "we already have 4 seats, we just need some of them together". He said I had gotten the last 4 seats and that I was lucky to have them- I explained that I had two very young children who could not sit alone and he said there was nothing he could do and it was up to me if I didn't want to travel. He told me to board the plane and ask the crew to try to sort it out.
We boarded and were told by the stewardess to take our seats and then they would sort us out. I pointed to the two kids and asked how I was supposed to get them to take a seat alone. She looked at me, turned to the pilot who was standing beside me and said, 'I can't believe ground staff have seated infants on their own'. At this stage one of the stewardesses just looked at the other stewardess and said- 'it's your problem, not mine' and walked off.
The other stewardess and the pilot were so nice and helpful and managed to get us two seats and two seats (thank you to the kind people who switched seats). In the meantime, the pilot gave my 4yo a tour of the cockpit (he was blown away!). I then saw the family who had gotten the seats together (knew the seat numbers) and saw they were all older children - what's up with that?
The rest of the flight was great- we waited an age for bags at MCO, but that's kinda normal there I think.
Oh, and I did witness something really unusual- there was a child travelling with her mother (about 6 or 7 yo) who was hysterical- she did not want to fly, did not want to sit in her seat. The stewardess (the same 'not my problem' one incidentally) was really brusque with the mother and told her she would have to get off the plane as the child was disturbing the passengers. Granted, the mother was a little ineffectual in dealing with the kid, but having been at the other end of one of those tantrums, I could sympathise. To my astonishment, they put the mother and child off the plane, then allowed some standby passengers on. I must admit, I've never seen this happen.
The return flight, I found fine- it wasn't busy, the plane was clean and comfortable, the stewardesses were pleasant. I think the whole seat assignment debacle was actually Delta staff rather than Song staff and we would probably fly Song again.
Packy- sorry to hijack your thread, but I'd be interested to hear your experiences.